There is a detailed German Wikipedia entry about the 1936 competition. In the match report there is this sentence “Der VfB verzichtete auf jede Effekthascherei und ließ nach englischer Art den Ball laufen”. This appears to be a comparison between VfB’s second half pattern of play and an English approach to playing the game.

Kicker has information about the teams. Of the players listed, ten of the eleven Schalke players have Wikipedia entries:

The German Wikipedia page about the game has one link to a VfB Leipzig player, Rudolf Grosse. This is incorrect. It is a link to a sociolinguist with the same name. He would have been 13 at the time of the final. Kicker has a date of birth for Rudolf as 25 August 1910.

Kicker provides dates of birth for 8 of the VfB Leipzig team and all of the FC Schalke 04 team. These data give the median age of VfB as 26.5 years ((range 20 to 30) and Schalke at 24 (range 18 to 31). Bruno Waller, the VfB goalkeeper, won the cup on his birthday.

If the start of the birth year was 1 January for German football, then the places in birth year for both teams at the time of the final were:

I am delighted Simon is on the case. I had better start scanning pre-1937.